Gotcha, I am having to look for this because I am having issues with the clientIdProperty, I can't send the record with an id, because my data model on the db side does like the 'Ext-record-1' part. Is there an easier way, to round trip id's without having to send the whole 'Ext-record-' part.

Option 1: Is it better to just send the 'ext-record' and round trip it to have it update the store,
Option 2: or is it cheaper sending amounts of data without the 'Ext-record-part and then set up a callback and manually loop through the store